datas=[
    #模拟第一类房子
{
    "city":"吕梁",
    "area":100,
    "room":2,
    "school":1,
    "style":1,
    "price":8000
},
{
    "city":"吕梁",
    "area":100,
    "room":2,
    "school":1,
    "style":1,
    "price":7800
},
{
    "city":"吕梁",
    "area":100,
    "room":2,
    "school":1,
    "style":1,
    "price":8200
 },
    #模拟第二类房子
    {
    "city":"吕梁",
    "area":100,
    "room":2,
    "school":1,
    "style":1,
    "price":8500
    },
    {
    "city":"吕梁",
    "area":100,
    "room":2,
    "school":1,
    "style":1,
    "price":8300
    },
    {
    "city":"吕梁",
    "area":100,
    "room":2,
    "school":1,
    "style":1,
    "price":8600
    },
    #模拟第三类房子
    {
    "city":"吕梁",
    "area":100,
    "room":2,
    "school":1,
    "style":1,
    "price":6300
     },
    {
    "city":"吕梁",
    "area":100,
    "room":2,
    "school":1,
    "style":1,
    "price":6200
    },
    {
    "city":"吕梁",
    "area":100,
    "room":2,
    "school":1,
    "style":1,
    "price":6000
    },
#模拟第一类房子
{
    "city":"太原",
    "area":100,
    "room":2,
    "school":1,
    "style":1,
    "price":12100
},
{
    "city":"太原",
    "area":100,
    "room":2,
    "school":1,
    "style":1,
    "price":11800
},
{
    "city":"太原",
    "area":100,
    "room":2,
    "school":1,
    "style":1,
    "price":11600
 },
    #模拟第二类房子
    {
    "city":"太原",
    "area":100,
    "room":2,
    "school":1,
    "style":1,
    "price":10900
    },
    {
    "city":"太原",
    "area":100,
    "room":2,
    "school":1,
    "style":1,
    "price":10800
    },
    {
    "city":"太原",
    "area":100,
    "room":2,
    "school":1,
    "style":1,
    "price":10000
    },
    #模拟第三类房子
    {
    "city":"太原",
    "area":100,
    "room":2,
    "school":1,
    "style":1,
    "price":9000
     },
    {
    "city":"太原",
    "area":100,
    "room":2,
    "school":1,
    "style":1,
    "price":8600
    },
    {
    "city":"太原",
    "area":100,
    "room":2,
    "school":1,
    "style":1,
    "price":8300
    },
    
    ]